Natural Product Herbicides for Control of Annual Vegetation Along Roadsides

Abstract

Natural product herbicides for vegetation control are being considered as alternatives to synthetic herbicides by many public agencies. Studies were conducted along roadsides at the Hopland Research and Extension Center (HREC) in 2001 and 2002 and on California State Route 29 (SR29) in 2002 to evaluate acetic acid, pine oil, and plant essentials compared with glyphosate for control of herbaceous vegetation. In 2001, annual grass control after a single application of pine oil at HREC was 40% or less effective, whereas acetic acid was at least 79% effective. A second application of pine oil or acetic acid did not control regrowth or new plants. In 2002, plant essentials was the most effective (Ͼ80%) natural product at HREC for control of annual grasses, except slender oat. Pine oil often provided similar control of slender oat as plant essentials (71 and 69%, respectively). At SR29, five applications of acetic acid provided 83% or better control of slender oat, hare barley, medusahead, and broadleaf filaree. Plant essentials and pine oil controlled hairy vetch, broadleaf filaree, and hare barley at least 83%, but yellow starthistle, soft chess, buckhorn plantain, and medusahead control never exceeded 85%. Glyphosate controlled all vegetation in these experiments with one or two applications. The cost of one or more applications of the natural products was greater than 10 times the cost of using one or two applications of glyphosate. Natural products were neither efficaciously nor economically comparable with glyphosate for control of annual roadside vegetation. Nomenclature: Acetic acid; glyphosate; pine oil; pine oil terpenes; plant essentials; 2-methoxy-4-(2-propenyl)phenol 2-phenethyl propionate; broadleaf filaree, Erodium botrys (Cav.) Bertol. # 3 ERO-BO; buckhorn plantain, Plantago lanceolata L. # PLALA; hairy vetch, Vicia villosa Roth # VICVI; hare barley, Hordeum leporinum L. # HORLE; medusahead, Taeniatherum caput-medusae (L.) Nevski # ELYCM; slender oat, Avena barbata Pott ex Link # AVEBA; soft chess, Bromus mollis L. #

Winter Cover Crops and Vinegar for Early-Season Weed Control in Sustainable Cotton

“…However, the overall level of cover crop kill provided by vinegar was inferior to that of glyphosate at 1 to 3 kg/ha (0.9 to 2.7 lbs/acre) (Hoffman and Regnier, 2006). Similarly, repeated applications of 5% to 7% acid vinegar provided only 60% to 80% control of hairy vetch (Young, 2004). At least 95% kill is needed in no-till systems, which, although not used in this study, are common in both sustainable and conventional crop production.…”

“…Because of its potential as a non-selective contact herbicide (Webber et al, 2005;Young, 2004), vinegar was evaluated as an alternative to synthetic herbicides, cultivation and hand-weeding. Past work (Showler and Greenberg, 2003) and this study found that Palmer amaranth, common purslane, and composites such as sunflower are the most common winter and early spring broadleaf weeds in cotton fields in the LRGV of Texas.…”

“…Vinegar has herbicidal effects on broadleaf and grass weeds (Fausey, 2003;Spencer et al, 2003;Webber et al, 2005;Young, 2004), and the high acetic acid content of immature mulches contributes to weed control (Ozores-Hampton et al, 2002). In the absence of synthetic herbicides, vinegar applications could kill cover crops before crop production begins, and reduce the need for frequent cultivation and hand-weeding during production.…”

Fitotoxicidad De Aceites Esenciales Y Extractos Acuosos De Plantas Mediterráneas Para El Control De Arvenses

“…Compuesto por alcoholes terpénicos y ácidos grasos. Su aplicación no consigue el nivel de control de arvenses que logra una única aplicación de glifosato (Young, 2004). …”

Status and Perspective of Bioherbicde Development for Organic Weed Management

“…정향유는 접촉형 비선택성 경엽처리 제초 제로서 지상부의 녹색 식생을 방제하며 세포막을 빠르게 파괴한다. 송근유(pine oil)는 테르펜 알코올과 지방산으로 구성되 며, 9.7-11.7% 액상유제 제형으로 비선택성 접촉형 제초제 로서 뉴질랜드 Certified Organics Ltd에 의하여 Interceptor 로 판매되고 있다 (Young, 2004). 제초제로서 지방산의 사용 잠재성은 오랫동안 알려졌다 (Poignant, 1954).…”